Xray Survey System for Barrel TRT Modules

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X-ray Survey Systemfor Barrel TRT Modules

• K. McFarlane
• Hampton University
• DOE/NSF Review, 20-Mar to 22-Mar 2001

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Summary

• Purpose gain and wire-position surveys on
  completed barrel TRT modules.
• Requirements
• Status

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Requirements

• Gain to 2 at at least 14 points on every straw
• XY position to 0.05 mm at 4 points on many
  straws
• Z position to 1 mm
• Complete all modules by April 2003 this means
  slightly more than one per week, with a start in
  June 2001.

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Prototype is Duke System
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X-ray survey system (XRSS)

• Micro-focus 80kV tube
• XY linear motions with resolution of 0.01mm in X
  and 0.2mm in Z
• GasSiplex front-end chips
• Cross-point switch, amplifiers and multi-channel
  analyzer DAQ
• PC-based readout and control
• Analysis by paw or ROOT

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Schematic
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XRSS Status Summary
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Safety, HE

• X-rays (60W at 80 kV)
• Source, if used (55Fe)
• High voltage (up to 2.5 kV on module, 80 kV on
  X-ray)
• Compressed gases
• Inert gases (ODH)
• Industrial (moving parts)
• Laser (alignment).

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Laboratory

• Two rooms (15x18) are being set up for this
  task
• Main issue left is HVAC for safety as well as
  control we need a separate system we are
  negotiating with HU administration.

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X-ray Source

• X-ray tube, power supply, controller, and cooler
  on hand
• 80 kV, 60W micro-focus tube with lt50 mm spot,
  continuous with lt1 stability
• Collimator is on order
• Shield box is in detailed drawing for manufacture.

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Mechanics -- Summary

• Framework assembled
• Linear motions assembled, aligned to required
  tolerances and tested.
• Module mount to be detailed for manufacture.

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Mechanics Frame
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Mechanics -- Motion
Stepper motors controlled byNational
Instruments motioncontroller and
LabView. Components in hand andexercised with
56 lbs onstage does not lose steps.
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Gas System -- Basic Schematic
GPIB
Controller
ODH
Channel 1
PT
Channel 2
Module
Channel 3
Channel 4
Each channel cylinder, regulator, manual valve,
flow controller.
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Features

• Oxygen and CO2 levels in room monitored
• System allows mixing of three components, to
  about 2 accuracy on each component
• Can use pre-mix
• Flow rate envisaged is up to 2 vols/h for above
  precision (baseline is 1 vol/h)
• Active gas can be re-circulated through module.

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Equipment selection

• Industrial ODH monitors (oxygen and carbon
  dioxide levels)
• High-purity or UHP gases and components
• Wetted parts are stainless steel, nylon, Viton,
  Kel-F, brass, nickel, chrome
• No grease of any kind

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Gas System Issues

• How leak-tight is the radiator volume?
• Is the 70/20/10 Ar/CO2/CF4 the correct mix for
  gain tests for barrel modules?
• What gas should be used for flushing the radiator
  volume? CO2 as in the TRT? An Ar/CO2 mix? The gas
  from the module?
• Can a different (cheaper?) gas be used for wire
  position surveys? (contd.)

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HV System

• Based in Bertan MWPC supplies, using remote
  control and monitor features

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Slow Control

• Based on National Instruments software and
  hardware

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Electronics

• SBA Stamp Board Adapter
• GPX Gassiplex FE board (chips on hand)
• CSX Cross-point switch based on AD8110
  (evaluation underway exceeds requirements)
• Amplifier In hand, tested
• Histogramming ADCs in hand and tested

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ADCs

• 40 MHz capability
• LabView support from vendor
• Tested and used

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Database and Analysis

• To be done
• Baseline for raw data is flat spectrum files on
  disk, in a structured set of folders with (long)
  names indicating conditions
• Base line for analysis is PawNT
• Work to be done!

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Module Test Issues

• What is Hamptons responsibility?
• HV aging done at Duke/IU
• Basic testing (and repair) done at Duke/IU
• On gain survey, how many points are needed (plan
  is for 14 per straw)?
• On wire position (relative to mounting pins), how
  many wires (4 places per wire)?
• Should Hampton plan to do tension testing? Wire
  replacement?

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Current status

• All components on hand or on order, except bulk
  CF4. Pre-mix Ar/CO2/CF4 on hand.
• Gas system is to be assembled and tested